Are these statements true or false ?

a)If the graph of a polynomial intersects the x-axis at exactly two points, it need not be a quadratic polynomial.

b) If two of the zeroes of a cubic polynomial are zero, then it does not have linear and constant terms

c) If all three zeroes of a cubic polynomial x^{3} + ax^{2} - bx + c are positive, then at least one of a, b and c is non-negative

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